EC103B

Current - On State (It (RMS)) (Max):	800mA
Supplier Device Package:	TO-92
Package / Case:	TO-226-3, TO-92-3 (TO-226AA)
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 110°C
SCR Type:	Sensitive Gate
Current - Non Rep. Surge 50, 60Hz (Itsm):	16A, 20A
Current - Off State (Max):	1µA
Current - Hold (Ih) (Max):	5mA
Series:	--
Current - On State (It (AV)) (Max):	510mA
Voltage - On State (Vtm) (Max):	1.7V
Current - Gate Trigger (Igt) (Max):	200µA
Voltage - Gate Trigger (Vgt) (Max):	800mV
Voltage - Off State:	200V
Part Status:	Obsolete
Packaging:	Bulk

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The EC103B thyristor, often referred to as an SCR (silicon-controlled rectifier), is a three-terminal electrical switch used for controlling the flow of current in alternating current (AC) applications. An SCR is usually considered to have both an anode and a cathode (the third terminal is a gate), and when the gate is connected to either the anode or the cathode, the device is said to be “turned on” or “triggered.” Once triggered, the SCR will remain conducting until the current flowing through it drops below the trigger current or the power supply is removed.The SCR’s application field is quite wide, ranging from light dimmers and motor control to switching power supplies. In these types of applications, the SCR controls the flow of current through the circuit, allowing it to be powered at different levels or to be shut off completely. The way the SCR works is simple: by varying the voltage across its terminals, the SCR can be “turned on” or “off.”The EC103B thyristor, for example, can be operated either in the “on” or “off” state. When it is switched “on”, the thyristor can pass an amount of current determined by the voltage applied to its terminals. When switched “off”, no current can flow through the thyristor.The EC103B also has several safety features. Its metal-oxide silicon (MOS) gate provides over-voltage protection, preventing the SCR from passing too much current through itself. It also has a fast avalanche breakdown voltage of 600 volts, which helps to protect the device from voltage spikes. A temperature monitoring system is also built in, allowing the EC103B to efficiently shutdown or reduce current flow in the event of excessive heat.The working principle of the EC103B is based on the principle of resistive bridging. When the voltage applied across the thyristor terminals is increased, the silicon gate turns on, causing the impedance of the path between the gate and cathode to decrease. This decrease in impedance allows current to flow through the device, and is described as the triggering action of the thyristor.The EC103B thyristor is an excellent choice for applications which require a fast switching action with minimal heat and power consumption. Its fast switching action, low power consumption and temperature monitoring system make it a great choice for motor control and power switching systems. However, since it does not provide protection against short circuits, the EC103B must be used in conjunction with other protective devices, such as fuses or circuit breakers.

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